<template>
    <div>
        <!-- 面包屑区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary">添加用户</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbuttom', i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染以及权限 -->
                            <el-col :span="5">
                                <el-tag  closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级权限 -->
                            <el-col :span="19">
                                <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success"  closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3,i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index" label="#"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                        <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限的对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defkeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表数据
            rolelist:[],
            // 分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 树状菜单图的数据源
            rightslist:[],
            // 树形控件的属性绑定对象
            treeProps: {
                label:'authName',
                children:'children'
            },
            // 默认选中的节点 id 值 数组
            defkeys:[],
            // 当前即将提交权限角色的id
            roleId: ''
        }
    },
    created() {
        this.getRolesList()
    },
    methods:{
        async getRolesList() {
            const { data: res } = await this.$http.get('/roles')
            if(res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败！')
            }
            this.rolelist = res.data
            console.log(this.rolelist);
        },
        // 根据id删除对应的权限
        async removeRightById(role,rightId) {
            // 弹框提示用户是否要删除
            const confirmResult = await this.$confirm(
                '此操作将永久删除该权限，是否继续？',
                '提示',
                {
                    confirmButtonText:'确定',
                    concelButtonText:'取消',
                    type:'warning'
                }
            ).catch(err => err)
            if(confirmResult !== 'confirm') {
                return this.$message.info('取消了删除！')
            }
            const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status !== 200) {
                return this.$message.error('删除权限失败！')
            }
            //this.getRolesList()
            this.$message.success('删除权限成功！')
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            // 获取所有权限的数据
            const { data: res } = await this.$http.get('rights/tree')
            if(res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败！')
            }
            this.rightslist = res.data
            // console.log(this.rightslist);
            
            // 递归获取三级节点的Id
            this.getLeafkeys(role,this.defkeys)
            this.setRightDialogVisible = true
            // console.log(res);
        },
        // 通过递归形式，获取角色下所有三级权限的id，并保存到 defkeys 数组中
        getLeafkeys(node, arr) {
            // 如果当前 node 节点不包含children 属性，则不是三级节点
            if(!node.children){
                return arr.push(node.id)
            }
            node.children.forEach(item =>
                this.getLeafkeys(item,arr)
            );
        },
        // 监听分配1权限对话框的关闭 时间 重置defKeys
        setRightDialogClosed() {
            this.defkeys=[]
        },
        // 点击为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),   // ...this 这种是展开运算符
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            // console.log(keys);
            const idStr = keys.join(',')   // 把 keys 里面的数组变为字符串用 英文 , 号隔开
            const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`,{rids: idStr})   // `roles/:roleId/rights`
            if(res.meta.status !== 200) {
                return this.$message.error('分配权限失败！')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList() // 刷新页面重新获取
            this.setRightDialogVisible = false
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}
.bdtop {
    border-top: 1px solid #eee;
}
.bdbuttom {
    border-bottom: 1px solid #eee;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>